xinhua2, are your IFR trained? If not, your remarks are merely ignorant and dangerous, if yes, for your own sake stay on the ground and get some training from a reputable source!
If an IFR pilot in IMC is flying an approach there is no danger because VFR traffic is grounded by definition.
Rubbish! The IFR pilot can be in IMC above the aerodrome with the VFR pilot in (marginal or otherwise) VMC below him. If the VFR guy ain't talking and has no transponder, he might be only feet away from the IFR guy breaking visual in the approach.
Remember at Class G aerodromes, there may not be a TAF and in the absence of more specific information, it's the PIC's responsibility to assess whether or not it's safe to fly, so you can't know as an IFR driver who may be out there VFR and why, hence the absolute importance of radio calls and airmanship. Bascially, if you haven't got a radio or don't know how to use it, it's criminal to scud-run around places where IFR traffic could be letting down.
Fact is VFR drivers overestimate their abilities and underestimate what weather can do to them. Read the book I mention, it's all there in numbers that are hard to dispute!
What we've heard here about training and operating standards of significant portions of the RAA community, is absolutely cause for grave concern
